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    <li class="self-crumb">cast&lt;<wbr><span class="type-parameter">RK</span>, <span class="type-parameter">RV</span>&gt; method</li>
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      <div><h1>cast&lt;<wbr><span class="type-parameter">RK</span>, <span class="type-parameter">RV</span>&gt; method</h1></div>

    <section class="multi-line-signature">
      <span class="returntype"><a href="dart-core/Map-class.html">Map</a><span class="signature">&lt;<wbr><span class="type-parameter">RK</span>, <span class="type-parameter">RV</span>&gt;</span></span>
            <span class="name ">cast</span>
&lt;<wbr><span class="type-parameter">RK</span>, <span class="type-parameter">RV</span>&gt;(<wbr>)
      <div class="features">override</div>
    </section>
    <section class="desc markdown">
      <p>Provides a view of this map as having <code>RK</code> keys and <code>RV</code> instances,
if necessary.</p>
<p>If this map is already a <code>Map&lt;RK, RV&gt;</code>, it is returned unchanged.</p>
<p>If this set contains only keys of type <code>RK</code> and values of type <code>RV</code>,
all read operations will work correctly.
If any operation exposes a non-<code>RK</code> key or non-<code>RV</code> value,
the operation will throw instead.</p>
<p>Entries added to the map must be valid for both a <code>Map&lt;K, V&gt;</code> and a
<code>Map&lt;RK, RV&gt;</code>.</p>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</span></h2>
      <pre class="language-dart"><code class="language-dart">Map&lt;RK, RV&gt; cast&lt;RK, RV&gt;() =&gt;
    new UnmodifiableMapView&lt;RK, RV&gt;(_map.cast&lt;RK, RV&gt;());</code></pre>
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